package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

//import java.lang.classfile.MethodSignature;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面，实现公共字段自动填充处理逻辑
@Slf4j
@Aspect
@Component
public class AutoFillAspect {
    //指定切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    //前置通知，再通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动赋值...");
        //获取当前被拦截的方法的数据库操作类型Update or Insert

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
         Object[] args = joinPoint.getArgs();
         if(args==null || args.length==0){
             return;
         }
         Object obj = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        long currentId= BaseContext.getCurrentId();
        //根据不同操作类型，为对应的属性字段赋值
        if(operationType == OperationType.INSERT){
            //为4个公共字段赋值
            try {
                Method setCreateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCteateUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(obj,now);
                setCteateUser.invoke(obj,currentId);
                setUpdateTime.invoke(obj,now);
                setUpdateUser.invoke(obj,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            //为2个公共字段赋值
            try {
                Method setUpdateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                //通过反射为对象属性赋值
                setUpdateTime.invoke(obj,now);
                setUpdateUser.invoke(obj,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
